JRuby Rails calls "invalid US-ASCII byte sequence" on for_fields

Question

JRuby Rails calls "invalid US-ASCII byte sequence" on for_fields

I have an application that works fine in Rails 4.1.4 with Ruby 2.1.2. When I switch to Rails 4.1.4 from JRuby 1.7.13, I get an encoding type error in polymorphic relationship addresses. I am using UTF-8 for internationalization.

This is the line she breaks into

<%= f.fields_for :addresses do |a| %>

My browser error

ArgumentError at /contacts/new
invalid byte sequence in US-ASCII

And the terminal says

Completed 500 Internal Server Error in 2139ms

ArgumentError - invalid byte sequence in US-ASCII:
  org/jruby/RubyRegexp.java:1642:in `==='
  activesupport (4.1.4) lib/active_support/core_ext/object/blank.rb:117:in `blank?'
  activesupport (4.1.4) lib/active_support/core_ext/object/blank.rb:24:in `present?'
  activesupport (4.1.4) lib/active_support/core_ext/object/blank.rb:44:in `presence'
  actionview (4.1.4) lib/action_view/helpers/capture_helper.rb:39:in `capture'
  actionview (4.1.4) lib/action_view/helpers/form_helper.rb:1860:in `fields_for_nested_model'
  actionview (4.1.4) lib/action_view/helpers/capture_helper.rb:38:in `capture'
  actionview (4.1.4) lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer'
  actionview (4.1.4) lib/action_view/helpers/capture_helper.rb:38:in `capture'
  actionview (4.1.4) lib/action_view/helpers/form_helper.rb:699:in `fields_for'
  actionview (4.1.4) lib/action_view/helpers/form_helper.rb:1859:in `fields_for_nested_model'
  actionview (4.1.4) lib/action_view/helpers/form_helper.rb:1845:in `fields_for_with_nested_attributes'
  org/jruby/RubyArray.java:1613:in `each'
  activerecord (4.1.4) lib/active_record/relation/delegation.rb:46:in `each'
  actionview (4.1.4) lib/action_view/helpers/form_helper.rb:1843:in `fields_for_with_nested_attributes'
  actionview (4.1.4) lib/action_view/helpers/form_helper.rb:1517:in `fields_for'

The fragment that I see in lib/active_support/core_ext/object/blank.rb:117

,

#
#   "\u00a0".blank? # => true
#
# @return [true, false]
def blank?
  BLANK_RE === self
end

I have declared UTF8 in many different places and config files and they check correctly. It doesn't seem to be related to environment variables, but rather embedded code.

I have checked the form representing the utf8 parameter

Parameters: {"utf8"=>"✓",

UTF8 configs

config / database.yml

default: &defaults
  adapter: postgresql
  encoding: utf8
  database: mydb
  pool: 5
  timeout: 5000

development:
  <<: *defaults
  adapter: postgresql
  database: dev_mydb

config / application.rb

config.encoding = "utf-8"

config / boot.rb

ENV_JAVA['file.encoding'] = "UTF-8"
ENV['LC_ALL']   = "en_US.UTF-8"
ENV['LANG']     = "en_US.UTF-8"
ENV['LANGUAGE'] = "en_US.UTF-8"

Gemfile

if RUBY_VERSION =~ /1.9/ # assuming you're running Ruby ~1.9
  Encoding.default_external = Encoding::UTF_8
  Encoding.default_internal = Encoding::UTF_8
end

As I said, the code works in Rails 4.1.4 with Ruby 2.1.2. Help is appreciated.

Here is a snippet from my db/schema.rb

address table file

# encoding: UTF-8
create_table "addresses", force: true do |t|
  t.integer  "kind"
  t.string   "address1"
  t.string   "address2"
  t.string   "address3"
  t.string   "city"
  t.string   "state"
  t.string   "postal_code"
  t.string   "country"
  t.integer  "addressable_id"
  t.string   "addressable_type"
  t.datetime "created_at"
  t.datetime "updated_at"
end